const setVal = new Set()
setVal.add(1)
setVal.add(2)
setVal.add(2)
setVal.delete(1)
setVal.clear()
console.log(setVal)

const noRepeat = new Set([1, 2, 3, 4, 5, 5, 5])
console.log(noRepeat)
console.log(noRepeat.size)